I certainly do have a choice not to use it... but then again, not really (I even said people are forced to stay in it due to network effects).

Theoretically speaking, maybe I love Google+ but none of the people I want to keep in touch with use it, and thus the lock-in. I get what you're saying. And I really only use Facebook for two things - keeping in touch with family and friends that do not live near me, and posting Anti-Facebook articles to my News Feed.